Exhaust turbocharger for IC engine - has ceramic turbine wheel with integrated axle stub fitting into contracted sleeve in metal shaft

摘要

Connection between ceramic wheel-integrated journal and coaxial street shaft comprises an axially aligned cup shaped shrink sleeve on the shaft. This positively grasps the journal in pre-tension and bear on this in the area ahead of the waisted section of the journal so that the sleeve end is off loaded in respect of the journal circumference. The sleeve base conforms in part to the endface of the journal. The journal (2) should be pre-tensioned against the base (6) of the shrink sleeve (4) and the sleeve endface (7) only bears in pre-tension on the journal as far as the minimum diameter area of the waisted part. ADVANTAGE - Shrink sleeve on shaft clamps round waisted journal in firm join proof against elevated temperature.